JPH0211719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grouting method for fixing a rock bolt, earth anchor, lock anchor, etc. in a ground borehole, and an apparatus used for the grouting.

Conventionally, in the construction of the lock bolts,
Capsules filled with synthetic resin adhesive are often used as fixing materials, but due to lack of adhesive strength, uncertainty in construction, and high cost, these have recently been replaced by easily procured capsules. An inexpensive cement-based adhesive is sealed in a capsule made of a liquid-permeable material such as water-absorbing paper or porous plastic, and the capsule is immersed in an adhesive activation liquid (e.g., water) to activate it. It has been considered to infiltrate the liquid from the surface of the capsule, then insert it into the hole, destroy the capsule when pushing the lock bolt, and force the activated adhesive into the hole to fix the lock bolt. . However, with this method,
If capsules are not immersed in the activating solution, the ratio of activating solution and adhesive (e.g., water to cement ratio) cannot be kept constant, and if the immersion time is too long, Not only does it take too long to bond, but in areas with spring water or upward facing holes, the adhesive may be diluted by water or flow out, resulting in incomplete installation.
Furthermore, if the immersion time is too short, there are problems such as poor curing of the adhesive and reduced strength.

The present invention was proposed in order to eliminate the disadvantages caused by the uneven immersion time of capsules in the activation liquid. Then, a fixed amount of adhesive activating liquid such as water is injected into the capsule from the end of the capsule, thereby making it possible to maintain a constant ratio of activating liquid and adhesive, and to increase the adhesive activity. The object of the present invention is to provide a device that can perform fixed-quantity injection of a chemical solution.

The present invention will be explained in detail below with reference to embodiments of the drawings.

In the present invention, a capsule filled with a cement adhesive is used as a fixing material for fixing the lock bolts in the borehole.

As the cement adhesive, a mixture of Bortland cement powder and calcium aluminate powder is mainly used. The mixing ratio of these is preferably 95 to 70% by weight of Bortland cement and 30 to 5% by weight of calcium aluminate powder.
Calcium aluminate has rapid setting properties, so it is particularly effective for construction in spring areas and upward drilling. In addition, inorganic sulfates (such as anhydrite) may be added to increase long-term strength and expandability, or reaction accelerators may be added to provide even faster rapid setting.
It is also preferable to mix aggregate.

The capsule enclosing the cement adhesive is
It is made of a material that is permeable to liquids and is mechanically destroyed by the insertion of lock bolts. For example, water-absorbing paper or porous plastic material is suitable.

Fig. 1 shows a fixing material 1 formed by enclosing the above-mentioned cement adhesive 2 into a capsule 3.It is generally formed into a rod-shaped body, and its diameter and length vary depending on the manner of perforation. It is determined appropriately depending on the length of the fixed part of the lock bolts, etc. When inserting the fixing material 1 into the perforation, an activating liquid such as water is injected into the capsule 3. Various methods can be considered for injection. For example, if you insert an injection needle connected to a metered-dose syringe all the way from one end of the capsule 3 and pull it out while squirting water, which is the activation liquid, from the tip of the injection needle, the water will flow into the capsule 3. The entire length of the penis will be injected and penetrated. Furthermore, as shown in Fig. 2, if the injection needle 4 is provided with a large number of ejection holes 5 along its length, the injection operation can be performed evenly with the injection needle 4 inserted all the way. It is reliable and convenient for making injections.

The fixing material 1 is inserted into the hole after injecting a required amount of water into the capsule 3, and then lock bolts are press-fitted and rotated to destroy the capsule 3 and stir the cement adhesive. The lock bolts are then fixed within the borehole within a short period of time due to the hardening of the cement adhesive. In this case, it is also possible to use a method in which a certain amount of mortar or aggregate is inserted into the borehole before or after the fixing material 1 is inserted.

In field work, it is required to maintain the ratio of activating liquid and adhesive and to uniformly inject the activating liquid reliably and quickly. FIG. 3 shows a device that can mechanically inject water into the capsule 3 in response to this request.

That is, this device is provided with a capsule housing tube 7 formed vertically long adjacent to a water tank 6, and in the center thereof, a large number of vertically long jet holes 8 are provided.
A hollow needle 9 is provided with a hollow needle 9 erected thereon. A check valve 11 having, for example, a ball-shaped valve body 10 is provided at the lower end of the hollow needle 9, and this valve 11 communicates with the lower end of an injection cylinder 13 provided at the bottom of the aquarium via a flow path 12. ing. A piston 15 that is urged upward by a spring 14 is provided in the injection cylinder 13, and the lower part of the injection cylinder 13 communicates with a water tank via a check valve 16, and the upper end thereof is connected to a water tank. An air supply pipe 17 is connected. The air supply pipe 17 extends outside the water tank and is connected to a compressed air supply source via a three-way valve 18.
Further, a pressure regulating valve 19 for adjusting the air supply pressure is provided at a suitable intermediate position of the air supply pipe 17.

Next, how to use this device will be explained.
First, turn on the compressed air source and use capsule 3.
is inserted into the housing tube 7 as shown by the chain line in FIG. The hollow needle 9 is thereby plunged deeply into the capsule 3. Next, when the three-way valve 18 is operated to start supplying air to the air supply pipe 17, the pressure regulating valve 1
The air whose pressure is regulated through the cylinder 9 pushes down the piston 15 in the cylinder 13. In this case, the cylinder 13 below the piston 15 is filled with water from the water tank 6 through the check valve 16, and the piston 15 presses this water. This water is prevented from flowing back into the water tank 6 by the check valve 16, so it passes through the flow path 12, pushes open the check valve 11, enters the hollow needle, and enters the cement-based adhesive from the numerous spout holes 8, 8. It will be squirted during 2.
This water injection is performed until the piston 15 reaches the lower end of the cylinder 13. As a result, cylinder 13
A certain amount of water filled with water is injected into the capsule 3. After filling the capsule 3 with water, the capsule 3 is taken out from the housing tube 7 and inserted into the perforation. Next, the three-way valve 18 is operated to cut off the supply of compressed air and simultaneously open the air supply pipe 17 to atmospheric pressure. As a result, the pressure above the piston 15 decreases, and the piston 15 is moved by the spring 14.
The pressure inside the cylinder 13 below the piston 15 is reduced, and the water in the water tank 6 is pushed up by the action of the check valve 1.
6 is pushed open to flow into the cylinder 13 and be accommodated therein. By repeating the above-mentioned operations, a fixed amount of water can be efficiently injected into any capsule 3.

As explained above, the present invention forms a fixing material in which a cement adhesive is sealed in a capsule during grouting work performed when fixing lock bolts in a borehole, and a liquid injection needle is injected from one end of the capsule. Since the activation liquid for the cement adhesive is injected from inside the capsule using the injection needle, the activation liquid can be well infiltrated into the cement adhesive. It is possible to completely prevent the failure of mortar hardening in the center of the capsule, which tends to occur with the conventional method of infiltrating the activation liquid from the outside of the capsule, and it is also possible to inject the activation liquid by visually checking the infiltration state on the capsule surface. It can be managed and work can be done reliably and easily. In addition, the device for injecting the activation liquid is easy to insert and remove capsules, and can inject the same volume of activation liquid into all capsules easily, quickly, and almost uniformly over a wide range. This has many excellent effects, such as being able to securely and firmly fix lock bolts.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the fixing material used in the present invention, Figure 2 is a side sectional view showing the state in which the activation liquid is injected into the capsule, and Figure 3 is an overview of the activation liquid injection device. FIG. 1... Fixing material, 2... Cement adhesive, 3... Capsule, 4... Injection needle, 5... Spout hole, 6... Water tank, 7...
Capsule housing cylinder, 8... Ejection hole, 9... Hollow needle, 11
...Check valve, 13...Cylinder, 15...Piston, 1
6...Check valve, 17...Air supply pipe.

Claims (1)

[Claims] 1. A fixing material is formed by sealing a cement adhesive in a capsule made of a mechanically destructible water-permeable material, and a liquid injection needle is inserted into the capsule from one end of the capsule. Lock bolts are inserted through the capsule, and an activating liquid for the cement adhesive is injected from inside the capsule through the injection needle, and then the fixing material is inserted into the hole. Grouting method for fixing. 2. A hollow needle, which is elongated in the vertical direction and provided with a large number of ejection holes, is erected in the housing cylinder of the fixative capsule, which is elongated in the vertical direction, and the lower end of the hollow needle is
One end of the cylinder containing the piston is communicated via a check valve, the other end of the cylinder is communicated with a compressed air source, and one end of the cylinder is communicated with a water source via a check valve. An activating liquid injection device used in a grouting method for fixing lock bolts, characterized by: